ExplanationFor the grouped data the formula of the median is given byMedian = L1 + I/F(N/2 - c)Whereas, L1 = Lower limit of the class in which particular partition values liesF = Frequency of the class intervalN = Total frequencyc = Cumulative frequency of the class preceding the class in which the particular partition value liesI= Width of the class intervalThis method is called the Interpolation method? For grouped data, the expression of the median is based on the interpolation method